Improvement in heaters



3 Sheets-r-Sheet 2.

G. JOSLIN.

Damper. I "No; 34.503. Patented Feb. 25, 1862.

' 3 Sheets-Sheet 3. G. JOSLIN.

Damper.

Patenfed Feb. 25, 1862.

-UNITED STATES PATENT OFFICE.

GILMAN JOSLIN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN HEATERS.

Specification forming part of Letters Patent No. 34,503, dated February25, 1862.

T0 at whom it may concern:

Be it known that I, GILMAN J OsLIN, of Boston,in the county of Suffolkand State of Massachusetts, have invented certain new and usefulImprovements in Heating Apparatus; and I do hereby declare that thefollowing description, taken in connection with the accompanyingdrawings, hereinafter referred to, forms a full and exact specification.of the same, wherein I have set forth the nature and principles of mysaid improvements, by which my invention may be distinguished from allothers of a similar class, together with such parts-as I claim, anddesire to have secured to me by Letters Patent.

The figures of the accompanying plate of drawings represent myimprovements.

Figure 1 is a central longitudinal Vertical section of my improvedheating apparatus. Fig. 2 is also a vertical section taken in the planeof my improvements for regulating the heat of the apparatus. Fig. 3 is aplan or top View. Figs. 4 and 5 are detail views, to be hereinafterreferred to.

In the construction of furnaces and other heating apparatus severalarrangements of devices have heretofore been experimented with for thepurpose of rendering them selfregulating; but these attemps have beenconfined to the object of keeping up a uniform temperature in theheating apparatus itself or else simply to the closing of thesmokedamper when the fire became kindled.

My invention contemplates a different obj ect-viz., that of varying thed egree of heat in the heating apparatus by the temperature and quantityof external air admitted theretowhereby the apartments themselves willbe kept at a uniform heat whatever may be the number to which hot air isto be supplied or the degree of cold without doors.

The manner in which I effect the object of my improvements is asfollows: I arrange a bar, rod, or plate of metal within the outer casingof the furnace in such a manner that the external air admitted theretoshall pass in the direction of the length of the rod, bar, or plate andin contact therewith and become heated during its passage. The expansionand contraction of this rod, bar, or plate, according to the quantityand temperature of cold admitted, is made by a series of devices to openand close a damper that regulates the draft of the fire.

I will next proceed to describe in detail a furnace having myimprovements applied thereto and possessing novel peculiarities thatwill be hereinafter fully explained.

a. a a a in the drawings represent the outer casing or brick-work of afurnace.

b b is the fire-pot, c the feedingchamber thereto, and d d the ash-pit.The fire-pot b b is inclosed within a metallic casing e e e,containing aseries of air-tubes fff, &c., and a series of water-heating tubes g g,850. The products of combustion after passing through the tubes g g,&c., escape into a drum h and find their exit through a smoke-pipe t'.The entire space around the series of tubes f f and g g, 850., and alsoaround the fire-pot, is filled with Water, which completely surroundsthe said tubes. Between the outer brick-work a aof the furnace and themetallic casing e e e is left a narrow chamber or space k is, withinwhich is placed a metallic rod or bar Z Z, between two fixed standards mm n n, united at the top and bottom by cross-bars 0 p. The lower portionof the bar Z l is secured by a nut (1 under the cross-bar p. The upperportion passes through a guiding-stirrup r r,.and has on its top a nuts, that bears upon the top of the stirrup r 'r. Betweenthe under side ofthe upper plate 15 of the stirrup r r and the top of the cross-bar 0 isinserted the end of a leverarm a u, the projections 11 w of which, Fig.4, are respectively inserted in corresponding sockets in the platet ofthe stirrup r r and the cross-bar o. On the lever-arm u u at any desiredpoint is placed a sliding weight u.

The object of hanging the lever-arm u. u in the manner described, bymeans of the projections a; w and their sockets, is to permit the readyremoval of the said lever-arm in case it may be desirable to take it outfor repairs or other purposes. The end of the lever-arm u it has passedthrough and secured to it by means of a screw-nut y a long rod 2 z, tothe end of which is secured a valve or damper a, moving in a box I),that communicates directly with the ash-pit d d,'the extent to which thedamper a is opened regulating the draft to the fire.

External or cold air is admitted to the furnace through an aperture 0 inthe brick-work a into the chamberor space k k, andso as to come incontact both with the rod or bar Z Z and the heated casing e e. Thetemperature at which the air enters through the aperture 0' will ofcourse produce either an expansion or contraction of the rod 1 Z, as thecase may be. Thus if air enters at a temperature of zero Fahrenheit, therodl lwill contract in the direction of its length, (provided the airpreviously in contact with it has been at a temperature above zero,) andthus by means of the lever-arm u u, rod 2 z, &c., open the damper a, andthereby increase the draft of the fire. The volume or quantity of airadmitted through the aperture 0 will also vary the expansion andcontraction of the plate Z Z, as the depth of the stratum of externalair that immediately comes in contact with the plate will be increasedor diminished in proportion to the supply drawn in, and thus if moreapartments are to be warmed the opening of their valves or registerswill increase the supply of external air to the furnace, and therebyopen the damper a accordingly. In the same way when the external airbecomes warmer or fewer apartments require the heated air and have theircommunication with the furnace closed, the bar or plate I Z will expandandclose the damper a in proportion to the said expansion. By thusregulating the fire in the fire-pot just in proportionto the temperatureof the external air and to the quantity of such air admitted to theapparatus, it will be evident that the temperature of apartments can bealways kept at a uniform and any stated degree of heat, and that thisregulating of the furnace will be effected by the action of theapparatus itself, so that when once set the parts will require nofurther adj ustmenti The set-screw y is used for regulating the rod 2 2,so that the damper a will be raised or lowered more or less by theaction of the lever-arm u u, and the weight will, it is evident,according to the different positions in which it is placed on the saidarm, regulate the extent of its movement.

Having thus described my improvements, I shall state my claims asfollows: WhatI claim as my invention, and desire to have secured to meby' Letters Patent, is

l. Varying'the temperature of the fire just in proportion to thequantity and temperature of the external air supplied to the furnace bymeans of a rod, plate, or bar so arranged as to have the air so admittedkeep in contact with it and cause the expansion and contraction of thesaid rod, plate, or bar, thereby regulating the draft of the fire, asset forth.

2. In heating apparatus constructed to operate substantially as hereinset forth, the arrangement of the lever-arm so that it can readily beinserted in or removed from its place by providing said lever with thepro-' jections r and w to fit into suitable sockets in the pieces whichcompose its fulcrum, as

described.

GILMAN J OSLIN. Witnesses:

JOSEPH GAVETT, A. W. BROWN.

